I set out for this ride having never spent more than five minutes on an e-bike. Curiosity got the better of me — I wanted to see what kind of real-world range I could get out of Trek’s Powerfly FS 8 with its 800Wh battery, right here in Cornwall.
The goal was simple: see how far a full-powered e-MTB could really go when ridden like any all-day adventure bike should. No charging, no switching it off on climbs — just a full day out in Eco+, using the bike exactly as intended.
The Original Plan
Distance: 119 km
Elevation Gain: 2,000 m
Estimated Time: 6 hours
Location: Cornwall
That combination of distance and ascent turns what could be a leisurely ride into a genuine endurance effort. The planned route wound through Cornish lanes, gravel sections, and off-road climbs that would test both my fitness and the Bosch Performance CX motor’s consistency.
What Actually Happened
The ride began with a flying start up the Coast to Coast Trail toward Portreath, climbing out before joining parts of the West Kernow Way to weave around Carn Brea. By the time I reached the stretch just past Hayle, the bike’s range prediction had taken a bit of a hit thanks to some steep, technical climbs that needed a little extra power.
A fast road descent into Porthleven gave me a breather and a few assist-free kilometres before my first stop of the day — the National Trust café at Penrose Estate. Five cans of fizzy drinks decanted into my bottles later, I was back on the move.
From there, I used a mix of road and trail to reach Gweek (and my favourite sausage roll), before taking on the steady climb from sea level up to the top of Rame. This section, with its mix of short technical pitches and winding woodland tracks, was the perfect place to see what the Powerfly could do off-road.
With 130mm front and 120mm rear suspension, it handled the singletrack beautifully — plush enough to smooth the roots and rocks, but still efficient when climbing. Dropping down into the Poldice Valley was a highlight; the Powerfly ate up the climbs and felt confident and planted when taking it off a few jumps.
Pushing Beyond the Plan
By the time I looped back toward home, I’d already covered the original 119 km target with about 30% battery remaining. It was just past 6 p.m., so I made a quick pit stop, grabbed some lights, and went back out — there was still power to spare, and I wanted to see just how far it could go.
A full lap of the Great Flat Lode, including the long climb up Carn Marth, should have pushed the battery to its limit. Even after that, it still showed 15%. So, I pushed on again toward Portreath for the second time, clocking up nearly 160 km before the display dipped to 3%.
I stayed local around Bissoe, riding short trail loops until the display finally hit 0%, rolling to a stop at 168 km. The Powerfly officially gave up just 1 km from home, leaving me with one last hill to tackle under my own steam — a fitting end to the day.
How the Powerfly FS 8 Performed
Motor & Battery: The Bosch Performance CX motor pulled smoothly all day, with predictable torque even late into the ride. Managing assist levels was key — keeping it in Eco+ for most of the route with a touch of Tour+ on the steeper climbs.
Battery Life: The 800Wh battery exceeded expectations, covering almost 170 km and 2,500 m of climbing on Cornwall’s rolling terrain. That’s real-world range that riders can actually count on.
Suspension & Comfort: With 130mm front / 120mm rear travel, the Powerfly FS 8 took the sting out of rough roads, gravel, and trails. After more than eight hours on the bike, I still felt capable of pushing through the final kilometres.
Handling: For a full-power e-MTB, it never felt cumbersome. The geometry strikes a great balance between trail capability and all-day comfort.
Takeaway
For anyone wondering if a full-power e-MTB like the Trek Powerfly FS 8 can truly go the distance, this ride proves it can. With smart assist management and steady pacing, it can easily handle a full day of Cornish climbing — and then some.
The Powerfly FS 8 isn’t just about getting you up singletrack faster. It’s a genuine adventure platform — a bike that makes long rides accessible, fun, and surprisingly efficient.
